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The colored dot perceived on Cartridge is ought to be positioned in the approved manner. Make sure if the color code goes with the symbol appropriately. Also, the Contacts located on the Cartridge must face the Printer just like its mentioned on HP DeskJet 3630 Setup. Finally, install the new cartridges and more instructions on how to replace black ink cartridge of HP DeskJet 3630 setup will be provided on our website. Keep in touch with our customer support team at the toll-free number +1-855-716-3550.